Coupling for lens mounts



v Nov. 10, 1931.

W. F. FOUQUET COUPLING FOR LENS MOUNTS Filed Spt, 5, 1929 v nuen or W/L /Affffoz/Qz/ET' By )C Homey Patented Nov. 10, 1931 UNITED STATES coUrLING Fon LENS ivroUNTs Application inea september 5, 1929. serial No. 390,548.

The object of this invention is to provide a. new and improved form of coupling for lens mounts for stereopticons and moving picture apparatus.

Another object of the invention is to make' Y a coupling for lens mounts adaptable so that additional lenses can be' easily and quickly added thereto to increase the size of the picture on the screen without interferring with or delayingy the showing of the picture through the lenses.

These and other objects of the invention will be illustrated in the drawings, described in the specification and pointed out in the claims at the end thereof.

In the drawings: p y i Figure 1 is a side elevation of the standard lens mount with my improvement added thereto.

Figure 2 is an elevation of my improvement viewed from the right as shown `in Figure 1.

Figure 3 is a bottom plan view of the mount shown in Figure 2.-

Figure 4 is an elevation of the slideV used to carry the extra lens.

Figure 5 is a horizontal section on the line 5w, 5m of Figure 4.

In the drawings like reference numerals indicate like parts.

In the drawings reference numeral 1 indicates the sleeve that carries the assembly of lenses for a moving picture or Stereopticon apparatus. These lenses will throw on the screen at a given distance a picture of a particular size. It is sometimes necessary to increase the size of the picture thrown on the screen as for instance when a smaller negative is used which of itself would give a. smaller picture. In such cases it is frequently desirable to increase the size of the picture on the screen to the same size that would appear if a larger negative were used.

To secure this result I provide an extra sleeve 2 containing certain lenses therein' which I mount in front 'of the sleeve 1 so that the light will travel through all the lenses. The second series of lenses contained in the sleeve 2 would be adapted to enlarge the picture that is thrown on the screen and bring a to the desired Size, auhugh-a is made by an undersi'ze negative.

For this purposeI-provide an attachment or coupling 3 which consists of a sleeve ,4 that is adapted to embrace the sleeve 1 and be clamped thereon. V'This sleeve 4 carries a socket plate 5 on'the: forward end thereof which Vplate has inturned flanges extending'l forwardly therefrom `on the two sides andv bottom thereof. These yflanges are spaced an equal distance from the center of ther-ound` opening 6 formed in the socket plate v5.

On the lower side, the sleeve 3 is slit circumferentially as indicated at 7 through an arc'of about 120 degrees. Two tongues 8 and 9 are thus formed on the sleeve which tongues.

PATENT er1--maf WILLIAM F. FOUQUET, or ROCHESTER, NEW YORK, ASSIGNOR Tov PROJEWI'O OPTICS ,y

co., or ROCHESTER, NEW vom; j y

are cut away as indicated at 10 to leave an" opening between the ends thereof.l On the ends of these tongues are fastened lugsjll and Y 12 in any suitable manner. Theselugs can be drawn together bylfscrew 13.f The sleeve 3 is adapted to make a close working or slid- V ing lit with the sleeve 1 which carriesthe original set of lenses. By turning the screw 13.V the tongues 11and 12 will bedrawntogether around thesleevel and thiswill cause the sleeve 3 to ly thus holding the attachmentin place thereon.

The second sleeve 2 makes threaded engagement with the `slide 15 which slide vhas a threaded. opening 16 therein as shown at 18. At the top of the slide 15 is provided a. handle 17. Vhen it ,is desired to change the 4size of the picture on the screen, the slide 15 carrying the Asleeve 2 with the lens assembly therein is dropped into the lsocket let-carried on the plate 5 and is thereby securely heldin place with the centralV axis of the lenses carried in the sleeve 1 and 2, substantially in line' with each other. In this position, the lenses of the second sleeve enlarge the picture on the' screen as may be desired.. When it isv clamp the Sleeve 1 very securedesired to remove the second set of-lensesthe film follows or precedes a motion picture film of the old or silent type. In the movie-tone ilm a part of the lm is used for sound reproduction and the space allotted to the negative of the picture is correspondingly reduced or madesmaller.` Vith thesame'flenses thesmallernegatives ofthe movie-tone ilm'will.

throw a correspondingly smaller picture on,V

the screen than will the larger negative of thev silent film. Then aV movie-tone lm follows a silent film the picture on the screen will appear smaller, but by theuse of this attachment with the eXtra set oflenses the picture on the screen will beienlargedtothe same size as the picture that was made of the preceding-silent film. When the running of" the movie-tone lilm has been ended and' ani-- othersilent film` is used, Y the eXtra lenses canfbe-removed and this insertion and removal'iof the-.extralensesfcan be donefby the operator4 without otherwise interfering with the'continuous operation.A of the; machineY and the; continuous projection.y ofthe picture on thefscreen'keeping the pictures on the screen,-

made from negatives of dierentsizes.

l; A? coupling for lens y mounts comprising a. sleeve; slit Acircumferentially and longitudionallywitlr intersecting slits to form two tongues therein; said. sleeve being adapted tol engage the` sleeve of a1 lens Inount means` for drawingA said` ton'gues'togetherto clamp thegco-upling sleeve on the sleeve of thelens mount. alsocket formed on the outer' end of" th'efcoupling'sleeve, ,a slide adapted to engagelini said socket, said slide having anopen` ing, therein norm-ally located substantially concentric: with theA lens sleeve, a second means'or'supporting-asecond lens mountin Y saidv opening said slide and secondlens-sleevefv supportedthereby being adapted'to 'bequickly insertediin the socket or'fremoved therefrom to change the magnifying power of the lenses* 2; A; coupling for'lens mounts comprising a coupling sleeve, meansprovided thereon by which' it is adapted to be-clamped-to the sleeve of. a. -lens mount, a socket formed Yonthe outer ends'of'tlrefcoupling sleeve7 and a slide ada-pted. to engage in said socket, said slide having an opening therein normally locatedsubstantia-llyuconcentric with the lens sleeve, a second f means forsupportinga secondlensmount inl said opening,V said slide and second 'lenssleeve supportedtherebv being adapted to be quickly inserted in the socket or removed therefrom to'change-themagnifying power of the lenses-ofthe firstl lens mount.

In testimony whereof I affix my' signature` IVILLI-AM F. FOUQUET. 

